<template>
  <!-- el-container是页面中的section -->
  <el-container class="home-container">
    <!-- 头部区域 -->
    <el-header>
      <div>
        <img src="../assets/heima.png" alt="黑马" />
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="loginOut">退出</el-button>
    </el-header>
    <!-- 页面内容区 -->
    <el-container>
      <!-- 左侧边栏 -->
      <el-aside :width="isCollapse?'64px':'200px'">
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!--  
          - unique-opened 唯一的,只留一个子菜单展开  
          可以:unique-opened='true 布尔值需要绑定一下不然是字符串 或者  unique-opened
          - collapse 是否水平折叠收起菜单
          用法同上
          - collapse-transition 是否开启折叠动画
          用法同上
          - router 是否使用 vue-router 的模式，启用该模式会在激活导航时以 index 作为 path 进行路由跳转
          用法同上
        -->
        <el-menu
          background-color="#333744"
          text-color="#fff"
          active-text-color="#409eff"
          unique-opened
          :collapse="isCollapse"
          :collapse-transition="false"
          router
          :default-active="activePath"
        >
          <!-- 一级菜单 -->
          <el-submenu :index="item.id+''" v-for="item in menulist" :key="item.id">
            <!-- 一级菜单模板区 -->
            <template slot="title">
              <!-- 图标 -->
              <i :class="iconObj[item.id]"></i>
              <!-- 文本 -->
              <span>{{item.authName}}</span>
            </template>
            <!-- 二级菜单 -->
            <el-menu-item
              :index="'/'+subItem.path"
              v-for="subItem in item.children"
              :key="subItem.id"
              @click="saveNavState('/'+subItem.path)"
            >
              <template slot="title">
                <!-- 图标 -->
                <i class="el-icon-menu"></i>
                <!-- 文本 -->
                <span>{{subItem.authName}}</span>
              </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 主体区 -->
      <el-main>
        <!-- 路由占位符 -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  data() {
    return {
      // 左侧菜单数据
      menulist: [],
      iconObj: {
        "125": "iconfont icon-users",
        "103": "iconfont icon-tijikongjian",
        "101": "iconfont icon-shangpin",
        "102": "iconfont icon-danju",
        "145": "iconfont icon-baobiao"
      },
      // 是否折叠
      isCollapse: false,
      // 被激活的地址
      activePath: ""
    }
  },
  // 左侧菜单的获取,在生命周期,创建时就要获取数据
  created() {
    this.getMenuList()
    this.activePath = this.Result.Get("activePath")
  },
  methods: {
    loginOut() {
      // 清空token
      window.sessionStorage.clear()
      // 重定向到登录页
      // this.$router.push("/login")
      this.Result.$path(this, "login")
    },
    async getMenuList() {
      // 获取菜单列表
      const { data: res } = await this.$axios.get("menus")
      console.log(res)
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg)
      } else {
        // 成功获取数据并赋值给data()里的数组menulist
        this.menulist = res.data
      }
    },
    // 点击切换按钮,控制菜单的折叠与展开
    toggleCollapse() {
      this.isCollapse = !this.isCollapse
    },
    // 保存链接的激活状态
    saveNavState(activePath) {
      // window.sessionStorage.setItem("activePath", activePath)
      this.Result.Set("activePath", activePath)
      this.activePath = activePath
    }
  }
}
</script>

<style lang="less" scoped>
.home-container {
  height: 100%;
}
.el-container {
  .el-header {
    background-color: #373d41;
    display: flex;
    justify-content: space-between;
    padding-left: 0;
    align-items: center;
    color: #fff;
    font-size: 20px;
    div {
      display: flex;
      align-items: center;
      span {
        margin-left: 15px;
      }
    }
  }
  .el-aside {
    background-color: #333744;
    .toggle-button {
      background-color: #4a5064;
      font-size: 10px;
      line-height: 24px;
      color: #fff;
      text-align: center;
      letter-spacing: 0.2em;
      cursor: pointer;
    }
    .el-menu {
      border-right: none;
    }
    .iconfont {
      margin-right: 10px;
    }
  }
  .el-main {
    background-color: #eaedf1;
  }
}
</style>
